Brass-truing machine



March 18, 1930.

BRASS TRUING MACHINE Filed July 1926 2 Sheets-Sheet l E. JQ MGKERNAN.1,751,214

March 18, 1930. E. J. MCKERNAN .y 1,751,214

l BRA'SS TRUING MACHINE Filed July 6, 1926 2 Sheets-Sheet 2 PatentedMar. 18, 193071l EDWARDJ. MCK'ERNAN, 0F TOPEKA, KANSAS' BRASS-TRUINGMACHINE Application filed July 65 1926. Serial No. 120,550.

My invention relates to a machine more es-V pecially intended formachining and truing the bearing surface of car brasses employed in thejournal. bearings of railroad cars.

6 The invention has for its object the pro vision of a portable handoperated machine constructed to` accommodate any size of car brass atpresent in use; the invention contemplating means whereby the brass issecurely held in place on thechuck of the machine and given a trueradius, and true, even bearing surface disposed square with the back ornon-wearing face of the brass.`

The objects and advantages of myl inven- '15 tion willibe more readilyccmprehended from the detailedy 'description of ing drawings, wherein-Figure 1 is a side elevation of my improved machine.

2 0 Figure 2 is a plan view thereof with a por. tion of the arbor brokenaway and-shown in section.

Figure 3 is a detail vertical sectional View taken on the-offset line3-3 of Figure L look- 2 5 ing in the directionof thearrows.

' Figure 4 is a detail view taken substantially on the line 4-44 ofFigure-l illustrating a portion of the drive* and driven elements.

Figure 5.is a 'detail sectional viewv of the operating mechanism at theright handv end ofthe arbor and feed screw asillustrated in Figure l. lFigure 6 is a detail perspective viewy of a feed-nut. f In'theparticular exemplifcation of the invention, the machineconsists ofthe two end castings or' standards 10, 1I connected together by thelongitudinal' frame members 12', 124 which. in turn provide suitablesupport for a chuck-'box indicated general-ly' at13", the upperout-turned' ends whereof... are secured to` theframe members-12 by meansof bolts 14. The chuck-box is provided with an ad justing wedge plate ormem-ber l, a liner 16 and av chuck proper or block 117;. the latterbeing provided with the stepped holdingsu-ri faces'flfSi,assshown'invFigureS. i

` The 'liner 11G-andthe chuck'17 areproperly alined inthef-chuckeboxl'3byfmeaaisof a suitable.1 bracketroi`vstrap'- 19 which extends aboutthe accompanyone end of the chuck-box and is properly secured thereto asfor example by bolts20, see Figures 1 and 2.

At the opposite end of the chuckeboX, I provide a bracket 21 whichactsvas asupport for an adjusting screw 22 which is threaded intovadjusting wedge 15; the bracket 21 also acts as a stop so that rotationof the, screw 22, by means of hand-wheel 23, will causethewedge plate 15to travellengthwise of the screw; longitudinal movement of the*` screwbeing prevented by bracket 21. As is apparent from the constructionshown, inward or outward movement of the wedge plate 1 5 will eithercause the chuck block 17 to be raised or loewered and thus determine orcontrol the relation of the brass operated on tothe cutting mechanismlater to be described. Y

After the brass (indicated: in dotted lines at A in Figure 3) has vbeenplaced onV the stepped surface 18 of the` chuck 17 (the stepped surfacebeing made to accommodate thechuck to varying sized brasses) the bra-ssis then clamped in place on the chuck yby means yof the hook members 24,.24' which are adapted to engage with opposite sides of the brass. Thelower ends of. the hook members 24 are secured to a clevis 25 locatedtr-ansversely beneath the chuck-box and which in turn is provided with aclamp screw 26 provided with handle 27; the clamp screw 26 abuttingagainst the bottom of` the` chuckboX v13. It is evident that upon properrotation of screw 26 through vthe .medium of handle 27 the hooks 24,724through themedium of clevis 25 willy be drawn downwardly with the upperends of vthefhooks in firm whereof are preferably provided with 'suit-'n able bushings 29. The arbor extends from end to end' lof the machine`in verticalaligI-rment `with `the longitudinal.- centerl ofjl thechuck, f see, Figure 3. The., tops of! 'theStandards-10am1l.areiShQwn-nordedewith l ico,

oil receiving apertures 30, for properly lubricating the arbor. Thearbor 28 is provided with a machined slot at 31, extending lengthwise ofthe arbor, in which a feed screw 32 is located and disposed lengthwiseof the Vmachine; the screw 32 extending through opposite ends thereof asshown in Figure l. The arbor bearing at the end ofthe machine Y providedwith-pedestal or supporting frame ll is supported by means of an arborbearing portion 33 formed to slide axially intoplace and to be securedto the supporting standard ll by means of suitable bolts as at 34.lVi'th this construction, it is apparenttljiateasy as-V4 sembly of theparts may be had and at the same time replacement and substitution ofthe cutter-head shown at 35 is readily permitted. Vhen it is desired tochangelthe cutters, the cutter-head'35 (having cutting tools 35a) ismoved along the arbor by means of feed-screw 32, until thecutter-headpractically reaches the arbor bearing 33.v The end of thefeed screw 32, adjacent to arbor bearing 33, is provided with a bearing36 and with a hand- `crank-37 whereby independent rotation of feed-screw32 may be induced and the cutterhead 35 caused to travel in the mannerstated. The bolts 34, which hold the arbor bearing 33 in place on'theout-board bearing casting or standard 11, are then removed, thusallowing the arbor bearing 33 to slide axially olf arbor 28. Thecutter-head or tool holding mechanism 35 may then be removed from thearbor 28 by turning a feed disc 38 located at the right hand end of thearbor.

The cutter-head 35 is provided with a feedl nut 39, shown in detail Y*inFigure 6. YThe V'cutter-head with the-feed-nut placed on. the end of thearbor 28 and feed-screw 32 andthe operations heretofore lmentioned inconnection with the removal of thefcutter-head are lthen reversed forthefpurpose otre-assembly.

The feed-screw 32 is supporte-d inthe machined slotdisposedlengthwise of,arborl 2,8 Vby means Vof two disc bearings, disc bearing 36 anda discbearing 41'at the opposite end. The disc bearing 36 is secured toone/fend of the arbor 28 for vexampleby means ofco'unterysunk headmachine screws, not shown; while bearing V41 is preferably Vmadesomewhat in the form of a cup-,- threaded on. the' cupped side to screwonto the end' o-arbor 28 and held-fromturning by means ofa screw 41a. Y-

y VPower isfim'parted to the arbor 2 8, in theV particularvexemplication of my invention, Vby

hand-crank 42 secured to a driving gear 43 which latter meshes with adriven gear 44, which latter is secured or keyed to one end of arbor 28.The driving gear 43 rotates on a stub-shaft 45 suitably mounted inthe'supporting standard 10.

` The feed disc 38 keyed or properly secured Y to the end of feed-screw32 against independent rotation is provided with a plurality ofv notchesdisposed `circumferentially equi-distances apart about the periphery ofthe disc vas shown at 46 in Figure 4. These notches are adapted'toreceive the hook-end 47 of a feed spring48 which is stationarily securedto the end casting or standard 10 in any suitable manner as for exampleby the bracket 49.

The feed spring 48 is intended to successively enter or engage a notch46`during each revolution of arbor 28 and thereby induce the,

feed-nut 39 with thecutter-head 35. to move a predetermined distancealong the arbor 28 and position the cutter-head relative yto the arcuatesurface of the brass so as to induce a cut to be made over the entireournal bearing face of the car brass.V The feed spring 48 induces apredetermined degree of rotation of the feed-screw 32 during thesuccessive engagements in the notches 46.y

After thecutter-head has moved from one Yend of the car brass to theother, the mechal Y nism maybe reversed so as to bring the cutter-headtoward the gear endofthe machine by operation of theVhand-.crank 37 (atthe out-board end l1 lofthe machine) secured to Y the feed-screw 32.Through operation ofthe hand-crank 37, the'cutter-block 35 with itscutting tools 35a is repositioned without necessitating a reverseoperation of the gear mechanismjthe operation of the feed-screw by meansofVhand-crank 37 inducing a faster return Vof the cutter' mechanismtoward the gear side of the machine withoutnecessitating rotation ofthecutter block. The ability to return the cutter-headin this mannereliminates any possibility' of wear on the cutting tools and thereforeat the same time avoids chatter marks being made on the car brass. TheystandardslO, ll areV shown secured to iio 'k'or mounted on` Ya.suitable platform or--base 50, thus enabling the machine to be placed inany desired position, or placedfon a small Y hand-truck to betransported'about the shop or moved to the place of'use.y 3

The machine as illustrated has proven very etlicient in practice,butmodications in certain respectsare possible and maybe made without,however, departing Yfrom the spirit of my invention. L

What'I claim is: Y 1 l. Ina brass truingmachine, a chuck box havingupstanding sides whereby the boxmay be secured to a supporting member,saidside vwalls having vertical slot-ways, the.l ends of the chuck boxbeing open, a chuck block., the lower .surface thereof is ,tapered7asimilarly 'izo tapered wedge block slidable on the bottom of said boXand beneath the chuck block, said wedge block having a threaded` boreeX- tending longitudinally from one end of the wedge block, a bracketdisposed about one ofthe open ends of the chuck boX for preventinglengthwise movement of the chuck block, an adjusting screw extendinginto the threaded bore of the wedge block, a second bracketdisposed atthe same end of the chuck box and through which the adjusting screw eX-tends whereby lengthwise movement of the screw is prevented, a pair ofupstanding arms disposed in the slots in the sides of the chuck box,having inwardly disposed upper ends above the chuck box, a transverselydisposed member beneath the chuck box pivotally connected at its ends tothe lower ends of the arms whereby both arms are operativelyconnectedtogether, and a clamp screw threaded through said last member andengaging the bottom of the chuck boX whereby screwing of the clamp screwcauses said transversely disposed member to ride lengthwise of the clampscrew and both arms simultaneously moved together.

2. In a brass truing machine, an open ended chuck boX having two sidewalls with vertical slots and terminating at top in supporting flanges,a chuck block provided with a depression on its upper surface havingstepped sides to receive brasses of different size, the lower surface ofthe chuck block being tapered, a tapered wedge block disposed throughoutthe'bottom of the boX andV slidable beneath the 'chuck block, meanssecured to one end of the chuck boX whereby lengthwise movement of thewedge block may be induced and its position maintained, a pair of hookmembers arranged on opposite sides in the slots of the chuck boX withtheir upper hook ends disposed inwardly to engage the upper sides of thebrass, a clevis pivotally secured to the lower ends of both hook member,and a clamp screw threaded through the clevis and adapted to engage withthe bottom of the chuck box whereby said hook members are drawndownwardly into clamping relation with the brass.

EDWARD J. MCKERNAN.

